<template>
  <div id="app">
    <form action="#" v-show="isAdd">
      	<h1>新增商品</h1>
        <div>
          <label>品牌名称:</label>
          <input type="text" v-model="name"/>
        </div>
        <div>
          <label>创立时间:</label>
          <input type="text" v-model="time"/>
        </div>
        <div>
          <button @click="submit">确定提交</button>
        </div>
    </form>
    <button class="btn" @click="isAdd = !isAdd">新增</button>
    <table class="tb">
      <tr>
        <th>编号</th>
        <th>品牌名称</th>
        <th>创立时间</th>
        <th>操作</th>
      </tr>
      <!-- 循环渲染的元素tr -->
      <tr v-for="item in list" :key='item.id'>
        <td>{{item.id}}</td>
        <td>{{item.name}}</td>
        <td>{{item.time}}</td>
        <td>
          <!-- 点击删除 根据id删除 -->
          <button @click="del(item.id)">删除</button>
        </td>
      </tr>
      <!-- 判断如果数组长度=o就显示 -->
      <tr v-if="list.length === 0">
        <td colspan="4">没有数据咯~</td>
      </tr>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [
        { id: 1, name: "奔驰", time: "2020-08-01" }
      ],
      isAdd: false,
      name:'',
      time:''
    };
  },
  methods:{
    // 确定提交
    submit(){
      this.list.unshift({
        //判断数组的长度
        id:this.list.length ? this.list.length+1 : 1,
        name:this.name,
        time:this.time
      })
      this.isAdd = false;
      this.name='';
      this.time='';
    },
    //根据id删除
    del(id){
      this.list = this.list.filter(ele => ele.id != id)
    }
  }
};
</script>

<style>
#app {
  width: 600px;
  margin: 10px auto;
}
.btn {
  border: 1px solid #ccc;
  margin-bottom:10px;
  margin-top:40px;
}

.tb {
  border-collapse: collapse;
  width: 100%;
}

.tb th {
  background-color: #0094ff;
  color: white;
}

.tb td,
.tb th {
  padding: 5px;
  border: 1px solid black;
  text-align: center;
}

.add {
  padding: 5px;
  border: 1px solid black;
  margin-bottom: 10px;
}
</style>